'use strict'

// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'development'
process.env.NODE_ENV  = 'development'

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
	throw err
})

// Ensure environment variables are read.
require('./config/env')

const fs                 = require('fs')
const chalk              = require('chalk')
const webpack            = require('webpack')
const WebpackDevServer   = require('webpack-dev-server')
const clearConsole       = require('react-dev-utils/clearConsole')
const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles')
const {
  choosePort,
  createCompiler,
  prepareProxy,
  prepareUrls,
} = require('react-dev-utils/WebpackDevServerUtils')

const openBrowser           = require('react-dev-utils/openBrowser')
const paths                 = require('./config/paths')
const config                = require('./config/webpack.config.dev')
const createDevServerConfig = require('./config/webpackDevServer.config')

const useYarn       = fs.existsSync(paths.yarnLockFile)
const isInteractive = process.stdout.isTTY

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
	process.exit(1)
}

// Tools like Cloud9 rely on this.
const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000
const HOST         = process.env.HOST || '0.0.0.0'

// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `detect()` Promise resolves to the next free port.
choosePort(HOST, DEFAULT_PORT)
  .then(port => {
	if (port == null) {
      // We have not found a port.
		return
	}
	const protocol = process.env.HTTPS === 'true' ? 'https' : 'http'
	const appName  = require(paths.appPackageJson).name
	const urls     = prepareUrls(protocol, HOST, port)
    // Create a webpack compiler that is configured with custom messages.
	const compiler = createCompiler(webpack, config, appName, urls, useYarn)
    // Load proxy config
	const proxySetting = require(paths.appPackageJson).proxy
	const proxyConfig  = prepareProxy(proxySetting, paths.appPublic)
    // Serve webpack assets generated by the compiler over a web sever.
	const serverConfig = createDevServerConfig(
      proxyConfig,
      urls.lanUrlForConfig
    )
	const devServer = new WebpackDevServer(compiler, serverConfig)
    // Launch WebpackDevServer.
	devServer.listen(port, HOST, err => {
		if (err) {
			return console.log(err)
		}
		if (isInteractive) {
			clearConsole()
		}
		console.log(chalk.cyan('Starting the development server...\n'))
		openBrowser(urls.localUrlForBrowser)
	});

	['SIGINT', 'SIGTERM'].forEach(function(sig) {
		process.on(sig, function() {
			devServer.close()
			process.exit()
		})
	})
})
  .catch(err => {
	if (err && err.message) {
		console.log(err.message)
	}
	process.exit(1)
})
